EP 0660017 A1 19950628 - Diagnostic control system for a pneumatic valve actuator.
Title (en)
Diagnostic control system for a pneumatic valve actuator.
Title (de)
Diagnose-Regelungssystem für ein pneumatisches Ventil-Stellglied.
Title (fr)
Système de diagnostic et de régulation pour un actionneur pneumatique d'une valve.
Publication
Application
Priority
IT MI932695 A 19931222
Abstract (en)
A control system for a pneumatic valve actuator comprising three operating blocks memorizing respectively the values of the spring pressure pm, the counter-thrust pressure pc and the friction pressure pa for the various valving member position values, said blocks being connected in parallel and, via a switch, to the valving member position transducer or to the set position generator and connected to the pressure computing block connected via a second switch to the pressure generator or, together with the value read by a transducer for the pressure existing in the actuator, to a differentiator connected to two multiplier units for K and for (1-K) respectively, which are connected to the transit memory of the pc operating block and to the pa operating block respectively, the switches being driven by a logic control unit which switches over when the valving member is at rest. Means are provided for sensing anomalies and the extent of wear. <IMAGE>
IPC 1-7
IPC 8 full level
F16K 37/00 (2006.01); G05B 23/02 (2006.01); G05D 16/20 (2006.01)
CPC (source: EP US)
F16K 37/0083 (2013.01 - EP US); G05B 23/0235 (2013.01 - EP US); G05B 23/0283 (2013.01 - EP US); G05D 16/2095 (2019.01 - EP US); Y10T 137/2409 (2015.04 - EP US); Y10T 137/8158 (2015.04 - EP US); Y10T 137/8175 (2015.04 - EP US)
Citation (search report)
- [X] EP 0264032 A2 19880420 - BOPP & REUTHER GMBH [DE]
- [A] US 4976144 A 19901211 - FITZGERALD WILLIAM V [US]
- [A] WO 9324779 A1 19931209 - SIEMENS AG [DE], et al
- [A] WO 9214087 A1 19920820 - COMBUSTION ENG [US]
- [A] US 4896101 A 19900123 - COBB HAROLD R W [US]
- [A] EP 0315391 A2 19890510 - WESTINGHOUSE ELECTRIC CORP [US]
- [A] US 4637002 A 19870113 - SALLAS JOHN J [US]
- [A] EP 0500986 A1 19920902 - MOOG GMBH [DE]
- [A] K. BEATTY: "INTELLIGENT VALVE BASED PROCESS SENSING AND CONTROL", ADVANCES IN INSTRUMENTATION AND CONTROL, vol. 46, no. 2, 1991, RESEARCH TRIANGLE PARK US, pages 1175 - 1185, XP000347557
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB LI NL PT SE
DOCDB simple family (publication)
EP 0660017 A1 19950628; EP 0660017 B1 19980805; AT E169387 T1 19980815; DE 69412223 D1 19980910; DE 69412223 T2 19990415; IT 1265319 B1 19961031; IT MI932695 A0 19931222; IT MI932695 A1 19950622; JP H07253818 A 19951003; US 5538036 A 19960723
DOCDB simple family (application)
EP 94203674 A 19941219; AT 94203674 T 19941219; DE 69412223 T 19941219; IT MI932695 A 19931222; JP 33510994 A 19941221; US 35951794 A 19941220